That would only be a factor if the passenger line were running to capacity; it's not. The limitation is getting the parts from the suppliers. Building assemblies for the freighter version that then have to be transported takes away resources from building parts for the passenger model. Also the freighter program was taking engineers away from fixing problems with the initial passenger variant.
Thats like saying its better the titanic was hit from the front because that means more people with buckets can report to the rear of the ship to help bail water.